Since the end of the recession in 2009. small businesses have a. decreased in number:
b. contributed an average of $2 billion per year to the U. S. economy.
c. struggled more than large businesses
d. generated the majority of new jobs.

d. generated the majority of new jobs.

Explanation:

Like other major recessions, the 2009 USA recession was characterized by substantial job losses. Many skilled employees become jobless. To earn a living, many of these skilled workers started small businesses. A majority had savings from their former employment.

Since then, the number of small businesses in the USA has grown tremendously. To date, small businesses are the largest employers in the USA.  A huge percentage of the new jobs created in the US economy originate from small businesses.

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(b) management: leadership